export function init(wrapper, options) {
    console.log('start handwritten');



    /**
     * 格式化日期.
     */
    Date.prototype.format = function (fmt) {
        var o = {
            "M+": this.getMonth() + 1, //月份
            "d+": this.getDate(), //日
            "h+": this.getHours(), //小时
            "m+": this.getMinutes(), //分
            "s+": this.getSeconds(), //秒
            "q+": Math.floor((this.getMonth() + 3) / 3), //季度
            "S": this.getMilliseconds() //毫秒
        };
        if (/(y+)/.test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
        }
        for (var k in o) {
            if (new RegExp("(" + k + ")").test(fmt)) {
                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ?
                    (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
            }
        }
        return fmt;
    }

    /**
     * 获取URL参数
     */
    function getQueryString(name) {
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
        var r = window.location.search.substr(1).match(reg);
        if (r != null) return unescape(r[2]); return null;
    }
    /**
    * 是否数字
    */
    function isNumeric(n) {
        return !isNaN(parseFloat(n)) && isFinite(n);
    }

    function myRedirect(nextw) {
        event.returnValue = false;//加这句
        this.location.href = nextw;
    }
    //当页面高度超过设备可见高度时，阻止掉touchmove事件。
    document.body.addEventListener('touchmove', function (e) {
        e.preventDefault(); //阻止默认的处理方式(阻止下拉滑动的效果)
    }, { passive: false }); //passive 参数不能省略，用来兼容ios和android 


    new lineCanvas({
        el: document.getElementById("canvas"), //绘制canvas的父级div
        clearEl: document.getElementById("clearCanvas"), //清除按钮
        saveEl: document.getElementById("saveCanvas"), //保存按钮
        //      linewidth:1,//线条粗细，选填
        //      color:"black",//线条颜色，选填
        //      background:"#ffffff"//线条背景，选填
    });

    function lineCanvas(obj) {
        this.linewidth = 1;
        this.color = "#000000";
        this.background = "#ffffff";
        for (var i in obj) {
            this[i] = obj[i];
        };
        this.canvas = document.createElement("canvas");
        this.el.appendChild(this.canvas);
        this.cxt = this.canvas.getContext("2d");
        this.canvas.width = this.el.clientWidth;
        this.canvas.height = this.el.clientHeight;

        this.cxt.fillStyle = this.background;
        this.cxt.fillRect(0, 0, this.canvas.width, this.canvas.height);

        //this.cxt.fillStyle = "red";
        //this.cxt.font = "16px verdana";
        //this.cxt.textAlign = "left";

        ////fillText("要添加的文字",x0坐标，y0坐标)
        //var orderedtime = new Date().getTime();
        //orderedtime = (new Date(orderedtime)).format("yyyy-MM-dd  hh:mm");
        //this.cxt.fillText(orderedtime, 30, 30);

        this.cxt.fillStyle = this.background;
        this.cxt.strokeStyle = this.color;
        this.cxt.lineWidth = this.linewidth;
        this.cxt.lineCap = "round";
        //开始绘制
        this.canvas.addEventListener("touchstart", function (e) {
            this.cxt.beginPath();
            this.cxt.moveTo(e.changedTouches[0].pageX, e.changedTouches[0].pageY);
        }.bind(this), false);
        //绘制中
        this.canvas.addEventListener("touchmove", function (e) {
            this.cxt.lineTo(e.changedTouches[0].pageX, e.changedTouches[0].pageY);
            this.cxt.stroke();
        }.bind(this), false);
        //结束绘制
        this.canvas.addEventListener("touchend", function () {
            this.cxt.closePath();
        }.bind(this), false);
        //清除画布
        this.clearEl.addEventListener("click", function () {
            this.cxt.clearRect(0, 0, this.canvas.width, this.canvas.height);
        }.bind(this), false);
        //保存图片，直接转base64
        this.saveEl.addEventListener("click", function () {
            var imgBase64 = this.canvas.toDataURL();
            console.log(imgBase64);
            return wrapper.invokeMethodAsync("invokeFromJS", imgBase64);
        }.bind(this), false);
        //添加日期时间
        function adddatetime() {
            this.cxt.fillStyle = "red";
            this.cxt.font = "12px '微软雅黑'";
            this.cxt.textAlign = "left";
            //fillText("要添加的文字",x0坐标，y0坐标)
            var orderedtime = new Date().getTime();
            orderedtime = (new Date(orderedtime)).format("yyyy-MM-dd  hh:mm");
            this.cxt.strokeText(orderedtime, 50, 100);
        }
    };


}

export function destroy(options) { 
}